Machine element or mechanism – Gearing – Interchangeably locked
Patent
1981-03-26
1986-04-29
Dorner, Kenneth J.
Machine element or mechanism
Gearing
Interchangeably locked
74333, 74363, 74374, 74475, F16H 308, B60K 2000
Patent
active
RE0321257
ABSTRACT:
A change-speed transmission with a shift mechanism which selectively couples a plurality of change gears one at a time to a shaft on which the gears are journalled. The shift mechanism is disposed entirely within the transmission housing and includes a shift key arranged for axial sliding movement in a groove in the shaft. A pair of axially spaced projections at one end of the key project outwardly of the groove to embrace a collar which is journalled on the shaft. The collar is axially shifted on the shaft by a rotary shift fork which engages a circular groove in the collar to selectively position the key axially of the shaft in its several gear-engaging positions. A third radial projection at the other end of the key engages a different gear in each of the several positions thereby drivingly coupling the selected gear to the shaft to provide various forward drive speeds. The end projection of the projection pair which embrace the collar is adapted to engage a reverse gear on the other end of the shaft for providing a single reverse speed. The arrangement and construction of the several gears and the shift key are such that when the key is shifted between adjacent gear-engaging positions, it always passes through a neutral position wherein no gear is drivingly coupled to the shaft. The shift mechanism includes a detent arrangement for positively establishing selected shift positions which are correlated to the gear-engaging and neutral positions of the shift key. The particular detent arrangement permits a neutral safety switch to be used with the swift mechanism without any additional parts other than the switch itself so that the engine to which the transmission is coupled may be cranked when the transmission is in any one of its several neutral positions. A modified change speed transmission is also disclosed incorporating an improved yieldable self-biasing spring shift key, gear construction and detent sector.
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Jolliff Norman E.
von Kaler Roland L.
Dorner Kenneth J.
Rolnicki Joseph M.
Tecumseh Products Company
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